DIY History | Transcribe | Scholarship at Iowa | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903 | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 12

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Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903

Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 12

Adjustment of the Reticle 
(From J. [F?] Hayford's report in the 67th annual report of the U.S. [Gart?] and [Geodetie?] Survey)

First. The view of the reticle must be in the common focus of the object-glass and eye-pieces. This adjustment is brought about by making two minor adjustments. 
I. Focus the eye piece by turning the telescope up to the sky and moving the eye-piece back and forth in its [tubes?] until that position is found where the [views?] are most distinctly seen. A mark should then be made on the [tube?] of the eye pieces so that it may be at once set to the proper focus. 
If any external objects are [?] thru the eye piece in addition to the [views?] of the [setiche?] seen projected against a uniform back ground (of sky for example; the eye will attempt in spite of its owner to focus upon those objects as well as upon the [wires?], and the object of the adjustment, viz ...., to secure a focus corresponding to a minimum strain upon the eye will in general not be attained

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Adjustment of the Reticle (From J. [F?] Hayford's report in the 67th annual report of the U.S. [Gart?] and [Geodetie?] Survey) First. The view of the reticle must be in the common focus of the object-glass and eye-pieces. This adjustment is brought about by making two minor adjustments. I. Focus the eye piece by turning the telescope up to the sky and moving the eye-piece back and forth in its [tubes?] until that position is found where the [views?] are most distinctly seen. A mark should then be made on the [tube?] of the eye pieces so that it may be at once set to the proper focus. If any external objects are [?] thru the eye piece in addition to the [views?] of the [setiche?] seen projected against a uniform back ground (of sky for example; the eye will attempt in spite of its owner to focus upon those objects as well as upon the [wires?], and the object of the adjustment, viz ...., to secure a focus corresponding to a minimum strain upon the eye will in general not be attained